The project took DeviantART member Unrellius 14 months. Inside is every character that appeared in the show, from Finn the Human to Liubot. To view a much larger version, go here, then click on the image. Warm up some Bachelor Chow, because it'll take a while for you to see everyone.
Is the Space Pope there? I can't find him.
-via Jeremy Barker
For your convenience I've highlighted him ;) : Space Pope! Woohoo!